Samsung AR09HSSDBWKNEU, Service Manual

Page: 94 / 109

Samsung Electronics 10-37
10-3 PCB Inspection Method
10-3-1 Pre-inspection Notices
1. Check if you pulled out the AC power plug when you eliminate the PCB or front panel.
2. Don't hold the PCB side not impose excessive force on it to eliminate the PCB.
3. Don’t pull the lead wire but hold the whole housing to connect or disconnect a connector to the PCB.
4. In case of outdoor PCB disassembly, check first the complete discharge of condenser after 1 minute power off.
10-3-2 Inspection procedure
1. Check connector connection and peeling of PCB or bronze coating pattern when you think the PCB is broken.
2. The PCB is composed of 3 parts.
. Indoor Main part : MICOM and surrounding circuit, relay, fan motor sensing and driving circuit, temperature sensing
circuit power circuit of SMPS, buzzer circuit. Communication circuit.
. Display part : LED lamp, Switch, Remote-control module.
. Outdoor Main part : MICOM and surround circuit, fan motor sensing and driving circuit, compressor driving circuit
power circuit of SMPS, PFC control circuit, 4way circuit, communication circuit,
OPTION.(EEV control circuit, temperature sensing circuit)
10-3-3 Indoor detailed inspection procedure
No procedure Inspection Method Cause
1
Plug out and pull the
PCB out of the control
box Check the PCB fuse.
1) Is 1st fuse disconnected?
2) Is 2nd fuse disconnected?
. Over current.
. Indoor Fan motor short.
. AC part and pattern short of Indoor PBA.
2
Supply power
If the operating lamp
twinkles at this time ,
the above 1)~3) have no
relation.
Check the power voltage
1) Is the BD71 input voltage
200Vac ~240Vac?
. Power cord is fault, Fuse open, Wrong Power
cable Wiring, AC part is faulty.
2) Is the voltage between both
terminal of C111(+)-(-) 12Vdc?
. Switching Trans of Power circuit is faulty.
3) Is the voltage between both
terminal of C118(+)-(-) 5Vdc?
. Power circuit is faulty, Load short.
3
Press the ON/OFF button.
1. Fan speed(high)
2. Continuous Operation
1) Is the voltage over DC 270V being
imposed on terminal #1~#3 of
fanmotor connector(CN72)? . Fan motor of the indoor is faulty.
2) The fan motor of the indoor unit
doesn't run.
. Fan motor connector(CN72) is faulty.
3) The power voltage between
terminal #1-#3 of the
connector(CN72) is 0V.
. PBA is faulty.